OilPanDestroyer wrote:
I'm trying to update Xcode and for some reason I can't. I constantly get an error saying, "There is not enough disk space available to install the product."
That isn't "for some reason". That is a very specific reason.
I have almost 40 gigabytes of free storage
No you don't. You may have almost 40 gigabytes of "available" storage. Apple started using "available" a few years ago. It does not mean the same thing as "free". It means that almost 40 gigabytes "could be" made "available" if you really needed it.
When you get an out of space error, sometimes the system will be able to convert some of that "available" storage to "free" storage. But you don't ever, ever want to rely on that. If you get that error message, you need to manually free up some space. Look for large files that you have created, on purpose. Don't go looking for files. If you are absolutely certain that you created a given file and you are 100% certain that you will never need this file, then don't touch it.
To make a long story short, that computer is never going too run Xcode. You need much more than 40 GB of free storage to run Xcode.